Grate bar



T. B. WREN GRATE BAR Filed Oct. 8. 1924 oooooooooo oooooof OOOOOOOOOO rlil Fetented July 2,0, 1926.

4UNITED erases THMAS n. WHEN, or MHANOY CITY, PE'NiisYLvQiNi.

GRATE BAR.

Aiiiiiication filed October s, i924. serial N5. maare.

VThe invention relates .to grate bars of the type used :in furnaces' and thelile, and has for its object to provide adevice of this ciaraeter having itsv ufperside. provided with, a longitudinally .tisposed groove and its under side with a longitudinally disposed downwardly extending flange for reinforcing and strengthening the bar. Also to provide the bar, adjacent its ends, with short downwardly extending flanges for stidening the bar and further bracing the saine against sagging, incident to intense heat.

A. further object is to provide the bar with a pluralityof tapered apertures having their wide ends downwardly disposed, and through which apertures air passes to the bed of coal ony the grate, and the small ends of the apertures being relatively small will not become clogged, and prevent the free passage of air therethrough.

it further object is to provide the sides of the grate bar with seinicrcular shaped apertures, which apertures, when the grate bars are placed in engagement with each other, form air passages similar to the air passages through the body of the grate bar.

With the above and other objects in view the i vention resides in the combination and arrangement of parts as hereinafter set fortli,shown in the drawing, described and claimed, it being understood that changes in the precise embodiment of the invention may be made within the scope ofl what is claimed without departing from the spirit of the invention.

In the drawing l Figure l is a top plan view of the grate.

Figure 2 is a vertical transverse sectional view taken on line 2-2 of F igui'e l.

Figure 3 is an enlarged bottoni plan view one end of the grate.

Figure Ll is a longitudinal sectional view through one end of a grate. showing the air passa-ges or apertures in inverted form.

Figure 5 is an end view of the grate shown in Figure et.

liteferring to the ('lrawing, the numeral l. designates an elongated grate bar adapted for use in furnaces and the like, and 2 a downwardly extending longitudinally disposed relatively wide flange carried by the' under side` of the grate bar for bracing the saine, and preventing the bar from sagging incident to intense heat. Disposed at opposite sides of the flange 2 adjacent the ends of the .grate be? er@ relatively Short reinforcfound, by providing the longitudinally dis-` posed groove 4 in the upper side of the grate har, in registration with the brace 2 on the under side. of the grate bar, the grate bar additionally braced, and at the same time considerable material is saved. Extending vertically through the grate bar is a plurality of tapered apertures 5, which apertures have their small ends upwardly disposed, and of a dia-meter suliiciently sinallto prevent particles of coal from falling into the apertures and clogging the saine. ri"he apertures, by being tapered, form funnel shaped members, through which the air passes and is discharged into the fire bed, therefore a more perfect combustion is obtained` within a fire box.

Referring to Figures 3 and et wherein a modified form is shown, the construction is substantially the. same as that shown in Figure 1, however the tapered apertures 5 have their wide sides upwardly disposed. This form of grate may be used where relatively large coal is used, otherwise the construction and operation is the same as that set forth in Figure l. The longitudinal sides G of the grate are provided with seniicircular shaped recesses 7, which recesses, when grates arc placed side by side in engagement with each other, will form apertures similar in shape and size to the apertures 5 in the main body of. the grate, consequently the entire grate surface in a furnace will present a irilurality of substantially equally spaced air passages or apertures with the exception of where the grooves l are disposed.

From the above it will be seen that a grate bar is provided which is thoroughly braced by ribs and a flange on the under side thereof. remote from the intensive heat, and that air passages are provided through the grate whereby air may easily pass to the fire bed.

t will also be noted that by placing the small ends of the tapered apertures 5, at the upper side of the grate, particles of coal of a substantial size. will not pass through the apertures and by tapering the apertures as shown afi 15 inforeing rib carried by the underside of the grate bar and connecting the transverse ly disposed flanges, of short longitudinally disposed reinforcing` ribs formed integral with the under side of the grate bar and the transversely disposed flanges in parallel relation to the iirst mentioned longitudinally disposed rib and spaced inwardly from the opposite sides of the grate bar and disposed between perforations in the grate bar whereby a free circulation ot' air is obtained at opposite sides of the short ribs for substantial" ly their full length.

In testimony whereof I have signed my naine to this specification.

THOMAS l. WR EN. 

